Normal Operation

Normal Operation

Off-Stoichiometric Operation

FIG. 5.19.5 Combining staged fuel burners with internal FGR. (Reprinted, with permission, from A. Garg, 1992, Trimming NOx from furnaces, Chem. Eng. Prog. [November].)

Burner Zone Heat Release Rate, 105 Btu/hr ft2

FIG. 5.19.6 Effect of nitric oxide concentrations with increasing burner zone heat release rate: 480 MW unit, natural gas fuel.

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